题目内容
脱式计算,能简算的用简算
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44÷
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考点:分数的简便计算
专题:运算定律及简算
分析:(1)、(2)用乘法分配律;
(3)除以两个数的积,变成连续除以每一个数;
(4)先算乘法,再算加法;
(5)一个数减去它本身,等于0;
(6)先算除法,再算乘法.
(3)除以两个数的积,变成连续除以每一个数;
(4)先算乘法,再算加法;
(5)一个数减去它本身,等于0;
(6)先算除法,再算乘法.
解答:
解:(1)(
-
)×48
=
×48-
×48
=42-10
=32
(2)
÷10+
×
=
×
+
×
=
×(
+
)
=
×1
=
(3)
÷(
×
)
=
÷
÷
=2÷
=2.4
(4)
+
×
=
+
=1
(5)
÷
-
÷
=0
(6)44÷
×
=30×
=11
| 7 |
| 8 |
| 5 |
| 24 |
=
| 7 |
| 8 |
| 5 |
| 24 |
=42-10
=32
(2)
| 5 |
| 9 |
| 4 |
| 9 |
| 1 |
| 10 |
=
| 5 |
| 9 |
| 1 |
| 10 |
| 4 |
| 9 |
| 1 |
| 10 |
=
| 1 |
| 10 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 1 |
| 10 |
=
| 1 |
| 10 |
(3)
| 7 |
| 8 |
| 7 |
| 16 |
| 5 |
| 6 |
=
| 7 |
| 8 |
| 7 |
| 16 |
| 5 |
| 6 |
=2÷
| 5 |
| 6 |
=2.4
(4)
| 4 |
| 7 |
| 5 |
| 18 |
| 9 |
| 5 |
=
| 4 |
| 7 |
| 1 |
| 2 |
=1
| 1 |
| 14 |
(5)
| 5 |
| 6 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 4 |
=0
(6)44÷
| 22 |
| 15 |
| 3 |
| 8 |
=30×
| 3 |
| 8 |
=11
| 1 |
| 4 |
点评:本题须根据题目中的数据特点,采用适当的方法计算.
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